Patent US860849A successfully refreshed from Google Patents.
Patent US2906790A successfully refreshed from Google Patents.
US2906790A
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Purification process
Assignee: Gulf Research and Development Co
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Filing: 1957-09-12
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Granted: 1959-09-29
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Expires: 1977-09-12
Abstract
No abstract record available.
Inventors
- 👤 Rex W Smyth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:17
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/148; C07C7/163; C10; C10G; C10G45/00; C10G45/32; C10G45/34; C10G45/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
A PROCESS FOR PURIFYING A MIXTURE CONTAINING A CONJUGATED DIOLEFIN HAVING A TOTAL OF 4 TO 28 CARBON ATOMS IN THE MOLECULE AS AN IMPURITY WHICH COMPRISES HEATING SUCH MIXTURE IN THE PRESENCE OF HYDROGEN AND A METAL CATALYST SELECTED FROM THE GROUP CONSISTING OF NICKEL AND NICKEL OXIDE AT A TEMPERATURE ABOVE ABOUT 150* F. BUT BELOW ABOUT 200* F. AND A HYDROGEN PARTIAL PRESSURE BELOW ABOUT 80 POUNDS PER SQUARE INCH GAUGE.
Claim 2
Dependent Claim
74 words
A PROCESS FOR PURIFYING A MIXTURE CONTAINING A CONJUGATED DIOLEFIN HAVING A TOTAL OF 4 TO 28 CARBON ATOMS IN THE MOLECULE AS AN IMPURITY WHICH COMPRISES HEATING SUCH MIXTURE IN THE PRESENCE OF HYDROGEN AND A METAL CATALYST SELECTED FROM THE GROUP CONSISTING OF NICKEL AND NICKEL OXIDE AT A TEMPERATURE ABOVE ABOUT 150* F. BUT BELOW ABOUT 200* F. AND A HYDROGEN PARTIAL PRESSURE BELOW ABOUT 80 POUNDS PER SQUARE INCH GAUGE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-28 | 1963-03-30 | 1963-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-28 | 1967-03-30 | 1967-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-28 | 1971-03-30 | 1971-09-29 | $7700.00 | Window Closed / Lapsed |